▎ 摘　　要

NOVELTY - An electrochemical device comprises an electrode assembly (100) in a wound structure. The electrode assembly is provided with a first bent section (1), where the electrode assembly comprises first pole piece (5) comprising a first current collector (51) and a first active material layer (52) arranged on the first current collector. The first current collector comprises a first portion and a second portion which are sequentially connected along the winding direction. The first active material layer is arranged on two sides of the first portion. The first active material layer is arranged on the inner surface of the second portion, and the second portion comprises a bending portion positioned on the outermost layer of the first bending section. The conductive piece is connected to the first active material layer arranged on the outer surface of the first portion and the outer surface of the second portion and/or arranged on the outer surface of the bent portion. USE - Electrochemical device for electronic device (claimed). ADVANTAGE - The risk of capacity loss of the electrochemical device caused by the fracture of the current collector or short circuit caused by the fracture of the current collector is reduced. The conductive piece is simple and reliable in structure and low in cost. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of an electrode assembly. First bending section (1) First section (2) Second bending section (3) Second section (4) First pole piece (5) Second pole piece (6) Isolating film (7) First current collector (51) First active material layer (52) Second current collector (61) Second active material layer (62) Electrode assembly (100)